package lab01;

public class Text05a {
    public static void main(String[] args) {
        int n = Integer.parseInt(args[0]);
        int sum = 0;

//for
        for (int i = 1; i <= n; n++) {
            sum += i;
        }
        System.out.println(sum);

 //while
        int i=1;
        sum=0;
        while(i<=n){
            sum+=i;
            i++;
        }
        System.out.println(sum);

//do-while
        i=1;
        sum=0;
        do{
            sum+=i;
            i++;
        }while(i<=n);
        System.out.println(sum);
    }
}
